Undergrad Observing a Collapsing Shell: Time Dilation Explained

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Observers inside a collapsing shell approaching a black hole's Schwarzschild radius would experience significant time dilation effects. As the shell contracts, the observer's clock would appear to run slower compared to a distant clock, while the external universe would seem to speed up. Once the shell passes the Schwarzschild radius, the observer becomes unable to detect local changes, as the event horizon expands outward at light speed. The discussion emphasizes that the observer can still move freely until the shell reaches them, despite the unusual scenario of being inside a black hole. Ultimately, the experience of time and observation is profoundly altered by the gravitational effects of the collapsing shell.
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Observer inside collapsing shell problem.
What does and observer inside of a collapsing shell observe? Lets say we have a shell of matter collapsing to a black hole. What would observers near the center see? How would the rest of the universe appear when,

The shell is approaching the Schwarzschild radius?

After the shell passes the Schwarzschild radius?

Time Dilation inside a hollow shell According to here you get time dialation, so what happens as the shell contracts?

Say the observer has a clock, and the inside of the shell is like a mirror, theres a clock attached to the shell and finally there's a clock at a great distance. How fast would these clocks go relative to eachother?

Until the shell reaches the observer, the observer is free to move aorund, so the issue to me seems to be that whe have a shell observer inside of a black hole, which normally you're not supposed to be able to have.
 
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Thread 'Am I understanding the concept of proper frame of reference?'

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